Hello, thanks for the feedback! We are working on letting you change the theme once again. In fact, once more finishing touches are placed, you may be able to change theme elements from within the theme like the background and colors, if you so choose, yourself. But this is going to take a fair bit of time. Thank you for your patience.
To get "mark forums read" in the blue theme, I need to click the three dots at the end of the line. fwiw. Driscoll's post. I can change to the other (non blue) theme, but that is all.